Can’t find a battery replacement
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Our batteries are Group 47 H5 (LxWxH: 9.5 x 7 x 7.5 inches). Google that group size and you'll find a number of choices available. I too like AGM batteries and will change to one when it comes time, but I'd do what you mentioned and warranty the OEM battery at the dealership as that wouldn't cost anything.
I will check out that size. Great info!
Don’t leave us hanging here, what’s the overnight reading this morning?
Stuck at home sick here, you are one source for breaking my boredom.🤣
Disconnected everything, but after fully charging yesterday, I am back down to 9.47 volts this morning. So not the alternator. And I unplugged absolutely everything. So the battery is not able to keep up with the parasitics, even overnight. I am going to warranty the battery and try to get them to let me upgrade and I’ll pay the difference in price.
9.47v ! I found an AGM replacement at Autozone. 680 CCA vs the OEM 530 CCA conventional lead-acid. Unfortunately I’d have to actually pay for it vs the free replacement at the dealer. As someone else mentioned, maybe they can credit me $100 for the stock battery they are going to use. Then I’ll effectively get the AGM upgrade for $130 or so. I want the power!
I wish you luck on getting that credit on the battery. Perhaps they would when you return the defective one honor it on your account for future parts or service.
Appreciate the update.👍
Worst case they can put another OEM in for free, then when I get home I’ll go over to Autozone and replace the OEM with an AGM and keep the OEM for my garage. I can use it for general utility around the house or even stick it in my Camry if I need to.
Looks similar to mine, and has similar 520 cca capacity. Most people seem to be fine, but the incidence of battery issues is much higher than the norm for our cx30s. Hey, no car is perfect. Cx-30 is close for my needs. I love the damned thing!
I have admittedly been a bit paranoid about my CX-30 battery after all the problems I had with my 2020 TNGA-gen Corolla SE sedan & random battery failures (3 different batteries in 2 years). But, so far no issues after 13 months & counting with my 2022 CX-30 CE - knock on wood. 
I live in southern, AZ where the heat can potentially kill batteries sooner, but my 2015 Yaris SE hatch 5-MT original factory battery was still chugging along fine for 4 years & 60K miles before vehicle was crunched by a careless driver in an accident (& I traded it for the 2020 Corolla after it was repaired).
I live in southern, AZ where the heat can potentially kill batteries sooner, but my 2015 Yaris SE hatch 5-MT original factory battery was still chugging along fine for 4 years & 60K miles before vehicle was crunched by a careless driver in an accident (& I traded it for the 2020 Corolla after it was repaired).
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My wifes cx5 had battery death at <3yrs. The headlights coming on and staying on while the motor is off is not helpful. I shut my cx30 off, but hers i leave on for safety. There are better batteries available with more cca.
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Sorry if I missed this answer but. Why is the dealer not helping you as that is an obvious warranty issue?
The dealer is fine. They will warranty the battery, but they’re just going to put in another 520 CCA battery. I want one of the better 680 CCA batteries that use AGM technology. So I’ll take it in, get my free battery during the scheduled oil change, and replace it at my expense with a better one later. I can always use the battery for something around the shop or stick it in another car.
I think this may be more of a thing at the higher trim levels. More accessories, more parasitic drain. I have the Turbo Premium Plus, and even at the very beginning, engine turnover seemed a tad labored. But like you said, love everything else and this issue is minor and correctable.
Yes agreed. A 680 cca AGM is on the requisition order.
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I had to get mine replaced under warranty at my 10k mile maintenance too.
That’s where I am, 10K. In the olden days I’d stick a truck battery in there and that would be that. But space is so limited under the hood these days and the CX30 has this plastic sleeve that only the exact size battery can slot into.
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